Grate structure



May 5, 1931. J GIBSON 1,803,327

' GRATE STRUCTURE Filed May 17, 1929 Patented May 5, 1931 NTED STATES rrn JOHN G. GIBSON, OF VEN'I'NOR, NEW JERSEY GRA'IYE STRUCTURE Application filed. May 17,

as are disclosed in my co-pending application 7 for Letters Patent, Serial No. 149,565, filed November 20, 1926. I i

In that disclosure I make use ofiwater grates, and in this particular case while using the same structure of. grates and units I discontinue the use of water in the grate and employ an air system in which cooled air is blown through the grate bars to become heated, and subsequently ejected' by a nozzle over the fire to better combustion and reduce the ash deposit. This may be said to be the leading object of the present invention.

A further object of the present invention resides in the provision of general details of construction and in the arrangement, combination, and connection of parts for attaining the results sought by the leading object,

The invention consists of the novel construction hereinafter described and finally claimed. 1

The nature, characteristic features and scope of the invention will be more fully understood from the following description taken in connect-ion with the accompanying drawings forming part hereof, and in which:

Fig. l, is a view in elevation of afurnace provided with my arrangement of grate structure.

Fig. 2, is a plan view of the grate with the furnace walls removed.

Fig. 3, is a view in section of the ejector nozzle.

Fig. 4, is a perspective view of one of the cube-shaped units.

For the purpose of illustrating my inven tion I have shown in the accompanying drawings one form thereof which is at presentpreferred by me,since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and 1929. Serial No. 363,971.

organization of the instrumentalities as herein shown and described.

In the drawings the reference numeral 1 designates a plurality of spaced, hollow, grate bars going to make up the grate of my invention. The opposed faces of these bars are each provided'at their bottoms with continuousfiangesQ so as to supportbetween them a plurality of air delivering units 3.

The units are preferably of v cube-shape, are hollow, and have open bottoms 4, and

perforated domes These units are pro- Vided'at their bottoms with flange 6. The units are positioned between the bars so that the flanges: 6 abut. The units are maintained in place by means ofcementitious material. By this arrangement of cube-like air units a large amount of air vents are spread generally over the grate surface, the advan-v tage of which is apparent. The top edges of the bars are slightly bevelled and also ta pered so that air jets may be'spread across the top surface of the-grate. The reference numeral 11 designates a motor for operating a blower 12. The blower 12 has piped cun-' nection at 10 with the head. pipe 13 of the furnace, which head pipe in turn is in communication by means of other pipes l lwith thefgrate bars in the furnace 9. The air from the blower 12.passes through the grate bars and gradually becomes heated as it nears the opposed side of the furnace. Here the heated air egresses through pipes. 1-5 to the head pipe 16 from whence it passes by pipe 17 to an ejector 18 provided with a perforated nozzle 19. The ejector is projected through the side of the furnace 9 above the grate bars so. as to eject heated air across the fire bed.

As the heated air under-pressure is blown across the fire bed complete combustion is obtained, thus reducing cost of maintenance,

providing more heat units,'and reducing ash deposits, it being understood that with decreased ash deposits' increased efiiciency or the furnace may be maintained. The reference numeral 8 designates a damper in pipe 10 so that air from the blower may be regulated as it passes to head pipe 13. B the arrangement above described I am enab ed to employ the motor grate shown in my patent application aforesaid With very slight change, the advantage of which is apparent.

What I claim is:

In combination, a furnace, a head pipe for cool air arranged at one side of said furnace, a plurality of spaced hollow grate bars extended through said furnace at right angles to said head pipe, a plurality of units having open bottoms and perforated tops fitted between said grate bars, a second head pipe arranged upon the side of said furnace opposite said first mentioned head pipe and in substantially the same plane with said first mentioned head pipe, the opposite ends of said grate bars being directly connected to said head pipes for uninterrupted circulation of air, a blower connected to said first mentioned head pipe for passing cool air to said grate bars, a profusely perforated nozzle extended through a side Wall said furnace in a plane above and parallel with said grate bars, and a pipe connection from said second mentioned head pipe to said nozzle for feeding heated air under pressure to said nozzle in a plane above and substantially parallel to the perforated tops of said units.

JOHN G. GIBSON. 

